You must say the shema no later than the end of the third halachic hour of the day in the morning. If you did not say it in time:

1. If it is before the fourth halachic hour of the day, say the entire shacharit service, as long as you will complete the amida before the end of the fourth halachic hour.
2. If it is after the fourth halachic hour of the day but before the end of the sixth halachic hour of the day, say birchot ha'shachar (and you may also say korbanot) and then skip all of shacharit up to the amida, which you should say as soon as possible.